消除浮顶罐罐内油气空间,是消除爆炸性气体最合适的方法。但浮顶()还会有可燃气体,必须防备顶盖上部的火花放电。
A.下面
B.上面
C.中间
D.外面
参考答案:B
Tom ____ like reading at all. He ______ interested in playing basketball. [ ]
A. doesn't;is
B. doesn't;were
C. is;does
D. was;is
WK-20型挖掘机最大挖掘半径为()米。
A.19.5
B.20
C.21.2
D.31